Vasodilation Assessment
Vasodilation Assessment - Related Videos
07:46
Assessing Endothelial Vasodilator Function with the Endo-PAT 2000
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Cited by 165 •
2010
A noninvasive procedure to assess endothelial function is demonstrated using the Endo-PAT 2000.
08:09
Vasodilation of Isolated Vessels and the Isolation of the Extracellular Matrix of Tight-skin Mice
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Cited by 1 •
2017
We describe the isolation of cardiac extracellular matrix from C57Bl/6J control mice, tight-skin mice, and tight-skin mice treated with the IRF5 inhibitory peptide. We also describe the vasodilation studies on the isolated vessels from C57Bl/6J, tight-skin mice and tight-skin mice treated with the IRF5 inhibitory peptide.
01:23
Antihypertensive Drugs: Vasodilators
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2024
Vasodilators, primarily affecting the smooth muscles within arterial and venous walls, are commonly used for hypertension treatment. Medications such as minoxidil and hydralazine primarily target arteries and arterioles, while sodium nitroprusside acts on arterioles and venules. Minoxidil, functioning as a prodrug, is metabolized by hepatic sulfotransferase into its active form, minoxidil sulfate, after oral administration. This metabolite binds to the sulfonylurea receptor (SUR) component of...
08:42
Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research
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Cited by 42 •
2014
Endothelial dysfunction is associated with numerous disease states and is predictive of adverse cardiovascular events in humans. Flow-mediated vasodilation (FMD) is a non-invasive ultrasound method of evaluating endothelial function. Methodological choices and operator experience may affect results. A systematic approach to FMD in human studies is discussed here.
05:41
Non-invasive Assessment of Microvascular and Endothelial Function
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Cited by 12 •
2013
Capillaroscopy is a non-invasive, relatively inexpensive methodology for directly visualizing the microcirculation. The forearm blood flow technique provides accepted non-invasive measures of endothelial function.
FAQs
Endothelial activation can increase nitric oxide signaling, which relaxes vascular smooth muscle. This relaxation widens the vessel and lowers vascular resistance, allowing the assessment to connect a measured change in diameter, blood flow, or pressure with endothelial function. Reduced responsiveness may therefore indicate impaired vascular regulation rather than simply a change in vessel size.
Vessel diameter, blood flow, and pressure provide complementary views of vascular reactivity. Diameter reflects physical widening, flow indicates the resulting circulation, and pressure helps show how the response affects hemodynamics. Changes in these measures can be interpreted alongside vascular resistance, because reduced resistance is an important consequence of smooth-muscle relaxation.
Physiological stimuli activate vascular responses through conditions such as exercise, whereas pharmacological stimuli challenge the vessels with an administered agent. Comparing responses to these stimulus types can help researchers examine vascular reactivity from different perspectives. The resulting measurements may show whether an intervention or disease state alters the response to endothelial activation.
Vascular resistance helps translate vessel relaxation into a circulatory consequence. When smooth muscle relaxes and the vessel widens, resistance can decrease, supporting greater blood flow or altered pressure relationships. Including resistance in interpretation prevents the assessment from focusing only on diameter and helps relate vascular reactivity to overall circulatory function.
The assessment applies a physiological or pharmacological stimulus and then quantifies the vascular response. Depending on the study design, investigators evaluate changes in vessel diameter, blood flow, or pressure after endothelial activation. These measurements are compared with the response expected under the tested condition to characterize vascular reactivity and identify impaired function.
Clinicians and researchers use vascular reactivity measurements to evaluate endothelial dysfunction and investigate conditions such as hypertension and cardiovascular disease. The approach also supports comparisons among treatments and examination of exercise-related responses. Because it produces measurable vascular outcomes, it can help monitor changes in cardiovascular risk over time.